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ASTM Grade HK Steel vs. S21904 Stainless Steel

Both ASTM grade HK steel and S21904 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HK steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
17 to 51
Fatigue Strength, MPa 150
380 to 550
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
78
Tensile Strength: Ultimate (UTS), MPa 500
700 to 1000
Tensile Strength: Yield (Proof), MPa 270
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 440
430
Maximum Temperature: Mechanical, °C 1100
980
Melting Completion (Liquidus), °C 1400
1400
Melting Onset (Solidus), °C 1350
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 25
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.4
3.0
Embodied Energy, MJ/kg 63
43
Embodied Water, L/kg 200
160

Common Calculations

PREN (Pitting Resistance) 27
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 48
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 190
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18
25 to 36
Strength to Weight: Bending, points 18
23 to 29
Thermal Diffusivity, mm2/s 3.9
3.8
Thermal Shock Resistance, points 11
15 to 21

Alloy Composition

Carbon (C), % 0.2 to 0.6
0 to 0.040
Chromium (Cr), % 24 to 28
19 to 21.5
Iron (Fe), % 44.8 to 57.8
59.5 to 67.4
Manganese (Mn), % 0 to 2.0
8.0 to 10
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 18 to 22
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030